﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;

namespace Infrastructure.Utilities
{
	/// <summary>
	/// http://www.wpftutorial.net/PasswordBox.html
	/// </summary>
	public static class PasswordHelper
	{
		public static readonly DependencyProperty PasswordProperty =
			DependencyProperty.RegisterAttached("Password", typeof(string), typeof(PasswordHelper), new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged));

		public static readonly DependencyProperty AttachProperty =
			DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(PasswordHelper), new PropertyMetadata(false, Attach));

		private static readonly DependencyProperty IsUpdatingProperty = DependencyProperty.RegisterAttached("IsUpdating", typeof(bool), typeof(PasswordHelper));


		public static void SetAttach(DependencyObject dp, bool value)
		{
			dp.SetValue(AttachProperty, value);
		}

		public static bool GetAttach(DependencyObject dp)
		{
			return (bool)dp.GetValue(AttachProperty);
		}

		public static string GetPassword(DependencyObject dp)
		{
			return (string)dp.GetValue(PasswordProperty);
		}

		public static void SetPassword(DependencyObject dp, string value)
		{
			dp.SetValue(PasswordProperty, value);
		}

		private static bool GetIsUpdating(DependencyObject dp)
		{
			return (bool)dp.GetValue(IsUpdatingProperty);
		}

		private static void SetIsUpdating(DependencyObject dp, bool value)
		{
			dp.SetValue(IsUpdatingProperty, value);
		}

		private static void OnPasswordPropertyChanged(DependencyObject sender,
			DependencyPropertyChangedEventArgs e)
		{
			var passwordBox = sender as PasswordBox;
			if(passwordBox != null)
			{
				passwordBox.PasswordChanged -= PasswordChanged;

				if(!(bool)GetIsUpdating(passwordBox))
				{
					passwordBox.Password = (string)e.NewValue;
				}
				passwordBox.PasswordChanged += PasswordChanged;
			}
		}

		private static void Attach(DependencyObject sender,
			DependencyPropertyChangedEventArgs e)
		{
			var passwordBox = sender as PasswordBox;

			if(passwordBox == null)
				return;

			if((bool)e.OldValue)
			{
				passwordBox.PasswordChanged -= PasswordChanged;
			}

			if((bool)e.NewValue)
			{
				passwordBox.PasswordChanged += PasswordChanged;
			}
		}

		private static void PasswordChanged(object sender, RoutedEventArgs e)
		{
			var passwordBox = sender as PasswordBox;
			if(passwordBox != null)
			{
				SetIsUpdating(passwordBox, true);
				SetPassword(passwordBox, passwordBox.Password);
				SetIsUpdating(passwordBox, false);
			}
		}
	}
}
